Jacob j



(No Model.) 7 J. J. UNBEHEND. 'RIVET.

W No. 481,125. Patented Aug. 16, 1892.

\AATNES E5! v \N\/ENTEH=' UNITED STATES PATENT OFFICE.

JACOB J. UNBEI-IEND, OF WALTHAM, MASSACHUSETTS, ASSIGNOR TO THE JUDSONL. THOMSON MANUFACTURING COMPANY, OF SAME PLACE.

RIVET.

SPECIFICATION forming part of Letters Patent No.481,125, dated August16, 1892.

Application filed January 18, 1892. Serial No. 418,437. (No model.)

To all whom it mag concern.-

Be it known that I, JACOB J. UNBEHEND, of Waltham, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Rivets, of which the following is aspecification.

This invention relates to rivets comprising a shank and a head bothformed in one piece, the shank being slotted, so that at its outer endit is divided into prongs adapted to be turned outwardly and clinch uponthe outer surface of one of the parts united by the rivet, the headbearing against the outer surface of the other part.

The invention has for its object to provide.

a rivet of this class the shank of which shall be adapted to readilypenetrate the substance of the parts to be united.

The invention also has for its object to provide a rivet with awedge-shaped Web adapted to tie or connect together the bases of theprongs and to readily penetrate the substance of the parts or layers.

To these ends the invention consists in a rivet composed of a shank anda head, the shank being slotted entirely across its outer end to formthe clinching-prongs and slotted lengthwise at opposite points to form awedgeshaped web connecting the bases of the prongs and adapted topenetrate the material into which the rivet is inserted, the sides ofthe wedge being of substantially uniform width from the apex to the baseof the wedge, as I will now proceed to describe.

In the accompanying drawings, forming part of this specification, Figure1 represents a side elevation of a rivet embodying my invention. Fig. 2represents a top view of the same. Fig. 3 represents a section on line 33, Fig. 1. Fig. 4 represents a perspective view. Fig. 5 represents amodification.

The same letters of reference indicate the same parts in all thefigures.

In carrying out my invention I form arivet composed of a shank a and ahead a formed in one piece, the shank being preferably cylindrical,although, if desired, it may be of tapering or any other suitable form,and when made tapering its outer end will be smaller than its inner end.The outer end of the shank is slotted entirely across to form theclinching-prongs a a which prongs may be of any suitable length. Fromthe slot which separates the prongs a a I extend 1onform width from endto end and formed to convert a portion of the shank into a wedgeshapedweb a the apex or cutting-edge of which is at its outer end and at thebases of the prongs a a the sides of said wedge being of uniform Widthfrom the cutting-edge to the base. I prefer to form the apex of said webwith a comparatively sharp cuttingedge, so that it will readily cut orpenetrate the material into which the rivet is driven. It will be seenthat the wedge-shaped web a not only enables the rivet to be morereadily inserted in the material than a rivet in which the bottom of theslot separating the prongs is substantially parallel with the plane ofthe outer end of the shank; but it will also be seen that the webconnects or ties together the bases of the prongs of the rivet, and thusprevents excessive spreading of said prongs dur ing the clinchingoperation.

The improved rivet presents the minimum of surface resisting theinsertion or driving of the rivet through the material, the only flatsurfaces which are substantially at right angles with the direction inwhich the rivet is driven being the outer ends of the prongs a Theprongs may be beveled or sharpened at their outer ends, as shown in Fig.5, or otherwise formed, to more readily penetrate the material. Theprongs may be turned inwardly in clinching, a suitable washer being usedwhen the prongs are turned inwardly.

I claim- The improved rivet hereinbefore described, composed of theshank and the head, the shank being slotted entirely across its outerend to form clinching-prongs and cut away lengthwise at opposite pointson its periphery to form a wedge, with an elongated cuttingedgeconnecting the bases of the prongs and adapted to penetrate and cut thematerial into which the rivet is inserted, the sides of said Wedge beingof uniform width, as set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 13th day of January, A. D.1892.

JACOB J. UNBEHEND.

\Vi tn esses:

C. F. BROWN, A. D. HARRISON.

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